155840021504 has 22 divisors (see below), whose sum is σ = 311527857534. Its totient is φ = 77920010240.

The previous prime is 155840021497. The next prime is 155840021527. The reversal of 155840021504 is 405120048551.

It can be written as a sum of positive squares in only one way, i.e., 92513305600 + 63326715904 = 304160^2 + 251648^2 .

It is a super-2 number, since 2×155840021504² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76092737 + ... + 76094784.

Almost surely, 2^155840021504 is an apocalyptic number.

It is an amenable number.

155840021504 is a deficient number, since it is larger than the sum of its proper divisors (155687836030).

155840021504 is an equidigital number, since it uses as much as digits as its factorization.

155840021504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152187541 (or 152187523 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 35.

The spelling of 155840021504 in words is "one hundred fifty-five billion, eight hundred forty million, twenty-one thousand, five hundred four".